The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2014
Filed:
May. 04, 2011
Applicants:
Thomas M. Rezachek, Cottage Grove, MN (US);
Gary P. Shubinsky, Buffalo Grove, IL (US);
Michael Freeman, Northville, MI (US);
Inventors:
Thomas M. Rezachek, Cottage Grove, MN (US);
Gary P. Shubinsky, Buffalo Grove, IL (US);
Michael Freeman, Northville, MI (US);
Assignee:
Honeywell International Inc., Morristown, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A photoacoustic detector includes first and second microphones carried by an acoustic sensing chamber. Signals from the microphones are processed using lock-in detection to increase the signal-to-noise ratio. An acoustic pressure generator can be incorporated to calibrate the microphones.